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l JOHN E.l ROBINSON, OF BOSTON, MASSACHUSETTS.

'Letters Patent No. 61,360, dated January 22, 1867.

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T0 ALL WHOM IT MAY CONOERN:

Be it known that I, JOHN E. ROBINSON, of Boston, in thecounty of Suolk, and State of Massachusetts, have invented an Improved Ice-Cream vFreezing Apparatus; and I do hereby declare that the following, taken in .connection with the drawings which accompany and form part of this specification, is a description of my invention sufcient to enable those skilled in the art to practise it.

The invention'relates to an arrangement and fncthod of operating rotary ice-cream freezers, and oonsists primarily in the disposition of a gang orserics' of cream cylinders, in a common ice or brine vessel, the cylinders being so arranged as to b'c simultaneously rotated byu single crank. The invention alsoconsists in combining with each of .a series of rotary cream cylidders, so arranged, a stationary scraper, and in the method of connecting each cylinder with its driving-shaft. The drawing represents a freezing apparatus embodying my invention- A. showing a plan of the same.

B, a vertical section o'n theiine a: rr. y

, a denotes the vessel for containing-the ice or freezing mixture; b b b b, a series of cylinders for containing thc cream to be frozen. Each of these cylinders is mounted on a short shaft, c, projecting up through the bottom plate d of the vessel a, and rotating in4 such plate, the shaft having a gear, e, at its lower end, as seen at B. Each shaft, c, has a screw, f, at its upper end, which enters a screw-thread formed in the spindle g of the cylinder, (as seen at 13,) thus enabling any one or more of the cylinders to be detachedfrom its rotating shaft a. The gears e mesh into and are driven by a central gear, 7L, on the top of a vertical shaft, c', at the bottom Aof which. is a bevel gear, 7c, driven by a-similargear on a crank-shaft, l, turning in bearings in the side walls of the vessel a. Each cylinder, b, has within it a scraper, m, made up of vertical. wires or plates, n, united by crosswires or arms, o, the wires n lyingloosely against the sides of the cylinder,^`and1soraping the adhering and freezing cream therefrom, and serving, in connection with the rotary motion ofthev cylinder, to keep up a circulation of the freezing and fluid particles of tho cream until it is all homogeneouslyjrozen. From the top vof each scraper frame rises a central spindle, p, projecting through the cover of the cylinder, and lhaving at its upper end a square or prismatic form, as sen at A. Adjacent toca-ch cylinder a locking plate, q, is hinged to the edge of the vessel a, this plate having an aperture, r, of form similar to top of spindle When'the freezer is to be operated all the locking plates are turned down against or so as to receive the tops of the spindles, and serve to keep the Scrapers stationary while the cylinders rotate, and also serve as bearings tO maintain the cylinders in propervertical position during their rotation. By this arrangementof the cylinders for simultaneous operation in the same freezing vessel, it will be obvious that the same amount of cream may be much more expeditiously, evenly, and conveniently frozen than where a large cylinder is employed I to hold all the-cream; and where the same or differently i'lavored creams are to be frozen, either cylinder may be disconnected from its driving-shaft when desirable, and being moved one side thereof, may be kept in the same -freezing vessel, and the frozen cream removed at pleasure, or may be removed from -the vessel and replaced on its shaft vby another cylinder with fresh cream. The driving mechanism may be placed over the top of the vessel,

'but for convenience of access to-thc cylinders, I preferthe arrangement shown.

I claim, in combination with a freezing vessel, a, the arrangement of a series of cream cylinders, 1), to be simultaneously rotated within the same, when each cylinder is so mounted as to becap'able of disconnection from the driving mechanism and removal from the freezing vessel,without disturbing the other cream cylinders, substantially as set forth.

I also claim, in combinationiwith suc-h an arrangement and method of operation of the cylinders, the stationary Scrapers, held in place during the rotation of the cylinders, substantially as described.

Also, mounting each cylinder one screw-shaft, and so as to be removable therefrom, 'substantially as and for the purpose described.

J. E. ROBINSON. Witnesses:

F. GOULD, S. B. Krnnnn. 

